查询词典 si

The constant current coulometry as a primary method is recognized in international. Based on Faraday's law of electrolysis, it has been successfully used to determine purity of arsenic trioxide. The measuring results depend directly on the reliability of measuring physical quantities and fundamental constants expressed in SI units, and do not need a reference material for comparison.

高精密库仑滴定法是国际上公认的基准测量方法，该方法根据法拉第电解定律，通过质量、电阻、电动势、时间等基本物理量及法拉第常数来进行三氧化二砷纯度的测定，直接溯源到国际SI单位，不需要用标准物质进行比对。

The effect of C and Si content on the corrosion process in the steel used for galvanizing vessel was researched.

探讨了热镀锌锅用钢中的C，Si元素含量对其腐蚀过程的影响。

The microstructure of hexagonal GaN grown on Si (111) has been studied.

研究了Si（111）衬底上生长的六方GaN的微结构。

The results show that MCM-41 with Si ∶KG-*3〗Al=100 exhibits a good catalytic activity and selectivity to guaiacol. This may mainly be attributed to the relative large pore size and the presence of suitable amounts of weak acid on the surface of catalyst.

结果表明， Si∶Al=100的MCM-41材料表现出较好的催化性能，样品较大的孔径和一定量弱酸中心的存在对反应有利。

Hall effect measurements reveal that the carrier mobility first increases rapidly and then decreases with increasing Si doping concentration.

霍尔测试结果表明，随着Si掺杂浓度的提高，样品中的载流子迁移率先增大后减小。

Hexagonal nano-silicon carbide thin films doped and undoped with phosphorus which possess a characteristic of the ultraviolet photoluminescence have been deposited by helicon wave plasma enhanced chemical vapour deposition technique under the high hydrogen condition in this work. The optical and electric properties of the doped nano-SiC films together with the electric and photovoltage properties of the n-p nc-SiC/Si heterojunction is studied and analyzed.

本工作利用螺旋波等离子体化学气相沉积技术在高氢气条件下制备了具有紫外发光的六角晶型纳米碳化硅，对这种材料进行了不同比例的磷掺杂，并对这种掺杂的纳米碳化硅的光学、电学特性以及nc-SiC/Si异质结的电学特性和光电压特性进行了研究。

The structure water is dehydrated completely as the temperature is over 1,100 K, the characteristic peak (3,580 cm-1) of the structure water disappears completely, the characteristic peak related to Si-Onb stretching vibration becomes 855 cm-1, which shows that primary Q1 of the hemimorphite is returned to Q0 (i.e [SiO4] ), and which means that the hemimorphite is completely transformed to willemite.

当升温达1 100 K以上，结构水的特征谱峰(3 580 cm-1)消失，与Si-Onb对称伸缩振动对应的特征拉曼谱峰变为855 cm-1，这标志着异极矿原有的Q1结构已完全转变为硅锌矿的Q0结构([SiO4]结构)，也就是说异极矿已完成向硅锌矿的转变。关键词：异极矿；原位拉曼光谱；测试；相变；高温

With oxalic acid and hexamethylenetetramine as the catalysts, and phenolic resin and tetraethoxysilane as the starting materials, a two-step sol-gel processing is developed for preparing Si〓N〓/SiC precursors with homogeneous microstructure composed of nanometer sized particles.

用草酸和六次甲基四胺为催化剂，酚醛树脂和正硅酸乙脂为原料，探索出了制备结构均匀而精细的Si〓N〓／SiC前驱体的溶胶—凝胶两步法。

A new cermet sinter with through micro-porous structure was developed by vacuum liquid phase sintering method, in which Al2O3-Ni-Cr-Mo-Si-Fe powder was used as the basic material, TiH2 and CaCO3 were used as the composite pore-forming materials and hominess grains was used as dispersal particles. The cermet sinter was then infiltrated with Ag-Cu-Pb-Sn at vacuum and formed a new high temperature self-lubricating material.

以TiH2和CaCO3为复合造孔剂，以硬质微细颗粒为惰性弥散质点，采用真空烧结法制备出具有贯通型微孔结构的Al2O3-Ni-Cr-Mo-Si-Fe系金属陶瓷烧结体，并在烧结体中浸渍Ag-Cu-Pb-Sn系浸渍型固体润滑剂制备出新型高温扩散自润滑材料。

Thus, we have prepared a-Si:H films under diverse conditions using hot wire assisted MWECR CVD.

因此，我们用热丝辅助MWECR CVD 系统在不同的工艺条件下沉积了a-Si：H 薄膜。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。